LabView instrumentoinnissa, 55492, 3op Labview in instrumentation • • • • • • • Lecturer: Heikki Ojala, [email protected]

, room C204a Physicum Teaching assistant: Hannu Koskenvaara, [email protected]

, room B436 Chemicum Course webpage: http://electronics.physics.helsinki.fi/?page_id=679 Time: Monday&Wednesday 12-14 Place: – Lectures in D104 on 7.11., 9.11., 16.11., 23.11., 28.11., 30.11.

– Excercises in D210 on 2.11., 14.11., 21.11., 5.12., 7.12., 12.12., 14.12.

Material: Lecture notes Supporting material: Learning with LabVIEW 8 (Robert H. Bishop) Exam: Monday 19.12.

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– Labview basics virtual instruments, data flow, palettes – Structures for, while, case, ...

– editing techniques – Controls&Indicators arrays, clusters, charts, graphs – Modular programming + recording SubVIs – File I/O – Analysis Linear algebra, Signal processing, Mathscript – Communication between loops Producer/Consumer, State Machine, Local variables – Instrument control DAQ, GPIB, Serial, Data collection

LabVIEW (Laboratory Virtual Instrument Engineering Workbench) • • Graphical programming language – – icons instead of text dataflow programming Virtual Instruments (VI) – – – measure, control, analyze, and store data look like physical instruments three main components: • front panel, block diagram, icon and connector

LabVIEW Programs Are Called Virtual Instruments (VIs)

Each VI has 2 Windows Front Panel • User Interface (UI) – Controls = Inputs – Indicators = Outputs Block Diagram • Graphical Code – Data travels on wires from controls – – through functions to indicators Blocks execute by Dataflow Execution elements (functions, structures, subVIs,...) are called nodes

Front panel and the associated block diagram

Icon and connector • specify the pathways for data to flow into and out of Vis – connect VIs to other VIs icon connector

Front panel Toolbar

Run Button Continuous Run Button Abort Execution Additional Buttons on the Block Diagram Toolbar Execution Highlighting Button Retain Wire Values Button Step Function Buttons

Controls Palette (Controls & Indicators) (Place items on the Front Panel Window) Control: Numeric Customize Palette View Indicator: Numeric Slide

Functions (and Structures) Palette

(Place items on the Block Diagram Window) Structure: While Loop

• • Context Help Window Help»Show Context Help, press the keys Hover cursor over object to update window

Additional Help

– Right-Click on the VI icon and choose Help, or – Choose “Detailed Help.” on the context help window

Labview Help

Help>>Find Examples

File>>New (from template)

More help & resources • NI.com

– active forums with professional help

Dataflow Programming

• Block diagram execution – – Dependent on the flow of data Block diagram does NOT execute left to right • Node executes when data is available to ALL input terminals • Nodes supply data to all output terminals when done Example: DataflowA.vi, DataflowB.vi

Keynotes

Keynotes